1、本网站免费注册后即可以下载，点击开通VIP会员可无限免费下载！
2、资料一般为word或PPT文档。建议使用IE9以上浏览器或360、谷歌、火狐浏览器浏览本站。
3、有任何下载问题，请联系微信客服。
扫描下方二维码，添加微信客服
No, I can’t. I can sing. Can you sing?
Yes, I can. I can … Can you …?
I can swim. Can you swim?
Now read the following sentences.
Grammar exercise
can
cannot
cannot
can
cannot
can
can
cannot
3
a. A man is going to see his boss. He is standing at the doorway.
May I come in?
b. A student is going to ask the teacher a question.
May I ask you a question?
c. A boy is thirsty. He is asking his mother for something.
May I have some water?
We use may and may not to ask for and give permission. In less formal situations, some people like to use can and cannot (can’t) for the same purpose.
“May” can be interchanged with “can”, but it’s a little more polite to use “may” .
B may and may not
May/Can I use your mobile phone? Yes, you may/can.
No, you may not/can’t.
You may/can turn on the TV.
You may not/cannot play in the kitchen.
Read the following sentences.
4
C must and must not